Beam-based spatial adaptation with asymmetric antenna panels

Abstract

Methods, systems, and devices for wireless communications are described. In some examples, a user equipment (UE) may receive a reference signal via a downlink beam from a network entity. The UE may perform measurements on the reference signal and report the measurements to the network entity via a beam report. In some examples, the beam report may indicate a request for uplink sounding at the UE or may indicate a downlink rank associated with each downlink beam indicated in the beam report. The UE may transmit the beam report in accordance with a trigger condition, such as a change in a quantity of antenna elements of an antenna port of the UE satisfying a threshold. The network entity may schedule a sounding reference signal (SRS) to be transmitted by the UE in accordance with the request, and the UE may transmit the SRS according to the scheduling.

What is claimed is: 
     
         1 . A user equipment (UE), comprising:
 one or more memories storing processor-executable code; and   one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
 receive, from a network entity, one or more downlink reference signals via one or more receive beams of the UE; 
 perform one or more measurements of the one or more downlink reference signals; and 
 transmit a beam report based at least in part on a capability of the UE and on the one or more measurements of the one or more downlink reference signals, the beam report comprising a request to perform uplink sounding at the UE or comprising one or more respective downlink rank indicators associated with respective beams of the one or more receive beams. 
   
     
     
         2 . The UE of  claim 1 , wherein, to transmit the beam report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:
 transmit the beam report comprising the request to perform uplink sounding at the UE based at least in part on a change in a quantity of antenna components of the UE per reference signal port.   
     
     
         3 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit a sounding reference signal (SRS) based at least in part on the beam report comprising the request to perform uplink sounding at the UE, wherein the SRS is scheduled within a quantity of symbols after transmission of the beam report.   
     
     
         4 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive, from the network entity, an indication of a configuration of one or more trigger conditions for the UE, wherein satisfaction of the one or more trigger conditions triggers the UE to transmit the beam report comprising the request to perform uplink sounding at the UE, wherein the one or more trigger conditions comprise a change in a quantity of antenna components of the UE per reference signal port satisfying a threshold, a quantity of slots prior to transmission of the beam report, or any combination thereof.   
     
     
         5 . The UE of  claim 4 , wherein the configuration indicates that, to transmit the beam report, the threshold for the change in the quantity of antenna components of the UE is satisfied within a quantity of slots before the UE is scheduled to transmit the beam report comprising the request to perform uplink sounding at the UE. 
     
     
         6 . The UE of  claim 1 , wherein, to transmit the beam report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:
 transmit a reporting quantity dedicated for the request to perform uplink sounding at the UE or for the one or more respective downlink rank indicators based at least in part on a capability of the UE to support uplink communications using multiple antenna panels.   
     
     
         7 . The UE of  claim 1 , wherein, to transmit the beam report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:
 transmit a single bit indicating the request to perform uplink sounding at the UE.   
     
     
         8 . The UE of  claim 1 , wherein, to transmit the beam report, the one or more processors are individually or collectively operable to execute the code to cause the UE to:
 transmit a plurality of bits indicating the one or more respective downlink rank indicators associated with the respective beams of the one or more receive beams.   
     
     
         9 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 perform a prediction procedure using a machine learning model to predict a change in a quantity of antenna components of the UE; and   transmit the beam report comprising the request to perform uplink sounding at the UE based at least in part on predicting the change in the quantity of antenna components of the UE.   
     
     
         10 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit a prediction confidence or a sounding pattern associated with uplink sounding at the UE to the network entity.   
     
     
         11 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit the request to perform uplink sounding at the UE via uplink control information (UCI) signaling or a medium access control-control element (MAC-CE).   
     
     
         12 . A network entity, comprising:
 one or more memories storing processor-executable code; and   one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:
 output, to a user equipment (UE), one or more downlink reference signals via one or more receive beams of the UE; 
 obtain a beam report comprising a request to perform uplink sounding at the UE or comprising one or more respective downlink rank indicators associated with respective beams of the one or more receive beams; and 
 communicate one or more signals with the UE based at least in part on the beam report. 
   
     
     
         13 . The network entity of  claim 12 , wherein, to communicate the one or more signals, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:
 output scheduling information for one or more subsequent downlink messages from the network entity based at least in part on the one or more respective downlink rank indicators.   
     
     
         14 . The network entity of  claim 12 , wherein, to communicate the one or more signals, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:
 output scheduling information for a sounding reference signal (SRS) based at least in part on the beam report comprising the request to perform uplink sounding at the UE, wherein the network entity schedules the SRS within a quantity of symbols after reception of beam report.   
     
     
         15 . The network entity of  claim 12 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:
 output, to the UE, an indication of a configuration of one or more trigger conditions for the UE, wherein satisfaction of the one or more trigger conditions triggers the UE to transmit the beam report comprising the request to perform uplink sounding at the UE, wherein the one or more trigger conditions comprise a change in a quantity of antenna components of the UE per reference signal port satisfying a threshold, a quantity of slots prior to transmission of the beam report, or any combination thereof.   
     
     
         16 . The network entity of  claim 15 , wherein the configuration indicates that, to transmit the beam report, the threshold for the change in the quantity of antenna elements of the UE is satisfied within a quantity of slots before the UE is scheduled to transmit the beam report comprising the request to perform uplink sounding at the UE. 
     
     
         17 . A method for wireless communications at a user equipment (UE), comprising:
 receiving, from a network entity, one or more downlink reference signals via one or more receive beams of the UE;   performing one or more measurements of the one or more downlink reference signals; and   transmitting a beam report based at least in part on a capability of the UE and on the one or more measurements of the one or more downlink reference signals, the beam report comprising a request to perform uplink sounding at the UE or comprising one or more respective downlink rank indicators associated with respective beams of the one or more receive beams.   
     
     
         18 . The method of  claim 17 , wherein transmitting the beam report comprises:
 transmitting the beam report comprising the request to perform uplink sounding at the UE based at least in part on a change in a quantity of antenna components of the UE per reference signal port.   
     
     
         19 . The method of  claim 17 , further comprising:
 transmitting a sounding reference signal (SRS) based at least in part on the beam report comprising the request to perform uplink sounding at the UE, wherein the SRS is scheduled within a quantity of symbols after transmission of the beam report.   
     
     
         20 . The method of  claim 17 , further comprising:
 receiving, from the network entity, an indication of a configuration of one or more trigger conditions for the UE, wherein satisfaction of the one or more trigger conditions triggers the UE to transmit the beam report comprising the request to perform uplink sounding at the UE, wherein the one or more trigger conditions comprise a change in a quantity of antenna components of the UE per reference signal port satisfying a threshold, a quantity of slots prior to transmission of the beam report, or any combination thereof.   
     
     
         21 . The method of  claim 20 , wherein the configuration indicates that, to transmit the beam report, the threshold for the change in the quantity of antenna components of the UE is satisfied within a quantity of slots before the UE is scheduled to transmit the beam report comprising the request to perform uplink sounding at the UE. 
     
     
         22 . The method of  claim 17 , wherein transmitting the beam report comprises:
 transmitting a reporting quantity dedicated for the request to perform uplink sounding at the UE or for the one or more respective downlink rank indicators based at least in part on a capability of the UE to support uplink communications using multiple antenna panels.   
     
     
         23 . The method of  claim 17 , wherein transmitting the beam report comprises:
 transmitting a single bit indicating the request to perform uplink sounding at the UE.   
     
     
         24 . The method of  claim 17 , wherein transmitting the beam report comprises:
 transmitting a plurality of bits indicating the one or more respective downlink rank indicators associated with the respective beams of the one or more receive beams.   
     
     
         25 . The method of  claim 17 , further comprising:
 performing a prediction procedure using a machine learning model to predict a change in a quantity of antenna components of the UE; and   transmitting the beam report comprising the request to perform uplink sounding at the UE based at least in part on predicting the change in the quantity of antenna components of the UE.   
     
     
         26 . A method for wireless communications at a network entity, comprising:
 outputting, to a user equipment (UE), one or more downlink reference signals via one or more receive beams of the UE;   obtaining a beam report comprising a request to perform uplink sounding at the UE or comprising one or more respective downlink rank indicators associated with respective beams of the one or more receive beams; and   communicating one or more signals with the UE based at least in part on the beam report.   
     
     
         27 . The method of  claim 26 , wherein communicating the one or more signals comprises:
 outputting scheduling information for one or more subsequent downlink messages from the network entity based at least in part on the one or more respective downlink rank indicators.   
     
     
         28 . The method of  claim 26 , wherein communicating the one or more signals comprises:
 outputting scheduling information for a sounding reference signal (SRS) based at least in part on the beam report comprising the request to perform uplink sounding at the UE, wherein the network entity schedules the SRS within a quantity of symbols after reception of beam report.   
     
     
         29 . The method of  claim 26 , further comprising:
 outputting, to the UE, an indication of a configuration of one or more trigger conditions for the UE, wherein satisfaction of the one or more trigger conditions triggers the UE to transmit the beam report comprising the request to perform uplink sounding at the UE, wherein the one or more trigger conditions comprise a change in a quantity of antenna components of the UE per reference signal port satisfying a threshold, a quantity of slots prior to transmission of the beam report, or any combination thereof.   
     
     
         30 . The method of  claim 29 , wherein the configuration indicates that, to transmit the beam report, the threshold for the change in the quantity of antenna elements of the UE is satisfied within a quantity of slots before the UE is scheduled to transmit the beam report comprising the request to perform uplink sounding at the UE.